Armature-core



UNITED STATE/s PATENT OFFICE.

HENRY G. REIST, OF LYNN, ASSIGNOR TO THE GENERAL ELECTRIC y COMPANY, OF BOSTON, MASSACHUSETTS.

ARMATuRE-CORE.

SPECIFICATION forming part of I ietters Patent No. 508,637, dated November 14, 1893.

Application iiled May 24, 1893. Serial No. 475,360. (No model.)

To a/ZZ whom it may concern:

Be it known that I, HENRY G. REIST, a citizen of the United States, residing at Lynn,in the county of Essex, State of Massachusetts, have invented a new and useful Improvement in the Construction of Armature-Cores, of which the following is a specification.

Myinvention relates to dynamo electric machines, and embodies an improvement in the construction of armature cores, whereby an. ple ventilation is obtained for dissipating the heat generated therein without detriment to the inductive qualities of the core, and without materially increasing the expense of construction.

Armature cores constructed in accordance with my invention are built up, in the usual manner, of annular iron larninze in layers, and the cylindrical core thereby formed is suitably supported by an internal support or spider adapted for the purpose. Instead, however, of making the core substantially solid from one side to the other, I build it up in sections or bundles of laminas of any desired thickness, and between each two sections I introduce skeleton separators, which consist in ribbed castings riveted or otherwise suitably fastened to the side of one of the laminae, and each adapted to bear against the outside lamina of the next section.

The accompanying drawings show various forms in which4 the separators herein described may be constructed.

Figure 1 is a side view of a portion of a. lamina for a smooth-wound. armature orv one having no iron projections, showing one form of separator. Fig. 2 is a face view of a portion of an armature in which are employed the separators shown in Fig. 1. Figs. 3, 4, 5 and 7 are separators of various forms applied to toothed laminze; and Fig. 6 is a face View of a portion of an armature in which are used the separators shown in Fig. 5.

Referring to Fig. 1, the separators A consist of thin fiat plates secured to the lamina B by the rivets h, and are provided with thin ribs a extending outwardly to the outer lamina of the adjacent bundle, as shown in Fig. 2. These ribs are radial to the center 0f the core, so that Ventilating` spaces are provided between each two ribs, as well as between the separators themselves. Three separators are shown in this figure, the iiat portion of the middle one extending back nearly across the lamina directly opposite to the spider-arm C, while the other two are slightly modified in shape, extending across the lamina in the same manner, but provided at their inner ends with extensions ct corresponding to the ribs, for the purpose of maintaining the same separation at the inner side of the core, as that maintained by the ribs at the outer side. In Fig. 3, substantially the same form of separator is shown applied to a toothed armature. Here, asin Fig. l, two forms are used, one form having a flat extension going back to the spider-arms C, and the other, used in the spaces between said spider-arms, having no such extension, but merely the flat portion and ribs at the outer side of the core. In this case the spaces in the toothed laminze are between the ribs.

In Fig. 4. the separators A consist simply of separate ribs riveted to the laminae, and of such shape as to afford the desired separation between the consecutive sections of laminas,

and leave sufficient air space for the purpose of ventilation.

The constructions shown in Figs. 5,' 6 and 7 are obvious modications, and require no further detailed description. Fig. 7 is a face View of an armature provided with the separators shown in Fig. 5, and shows the ventilatin g spaces afforded thereby after the armature is completed. Fig. 6 shows a lamina having extensions C between which is formed an undercut opening into which the spider or supporting shell may be dovetailed. The separator herein shown is made up of ribs extending radially across the laminas, and flat portions connecting said ribs. The separators herein described may be made of brass or other metal, cast in the shape desired,and do not require any finish, except, perhaps, on the surfaces which bear against the laminas. They can be secured to the laminae by rivets, as shown, or by any other suitable means. In building up an armature, a suitable number of laminee are bundled together in sections, and a lamina provided with separators, as shown, added thereto. A sufficient num- IDO shown in Figs. 2 and 6, mounted on the spider or internal support, as best indicated in Figs. 3, and 5 and clamped together in the usual manner.

The separator of my invention is especially adapted for use with Pacinotti rings or pro jection armatures and, as shown in Figs. 3, 4, 5, 6 and 7, it is preferably shaped to follow the contour of the iron tooth or projection and provides therefor a rigid backing to hold the laminae from displacement when the plates are powerfully forced together in a press. When such armatures are of large size it is essential that Ventilating spaces be provided between the bundles of laminte, as shown, to prevent undue heating, and the narrow portions of the teeth or projections would, ordinarily, under the action of the press during the assembling of the armature, be forced or bent out of position so as to occupy the space between the bundles of laminae which it is desired shall be maintained open or clear for ventilation.

Vhle I have mentioned above that the separators may be made of ribbed castings I propose, also, in some cases, to make them of sheet metal stamped to a suitable form, portions ofv the separator being bent at rightangles to give the requisite spacing between the bundles of lamintc of iron, and a flat portion of the separator lying against the iron lamina or sheet and being riveted or other- Wise secured thereto, the iron lamina with the separators attached thereto being interspersed with the bundles of laminse comprising the main portion of the armature core, as shown.

What I claim as new, and desire to secure by Letters Patent, is-

1. A laminated armature core built up in sections, and separators attached to the laminte between two consecutive sections, as and for the purpose described.

2. In an armature core the combination with sections built up of laminte, of separators consisting of ribs of metal between said sections, and in contact with adjacent laminze whereby Ventilating space is afforded between the inner and outer surfaces of said core, as described.

In a laminated armature core built up in sections,a separator comprising a iiat por tion riveted tothe outer lamina of one of said sections, and ribs extending outwardly therefrom to the adjacent sections and radial to the center of the core, whereby air passages are afforded between the inner and outer surfaces of the said core, as described.

4. In a toothed armature core built up of laminated sections, separators consisting of ribs extending outwardly from the teeth on one of said sections to the corresponding teeth on the adjacent section, whereby said sections are mutually supported and air passages radial to the centerof said core afforded, as and for the purpose specified. j

5. An armature core consisting of laminaa arranged Side by side and separators attached to certain of the laminze to form a Ventilating space or spaces in the core.

6. An armature core consisting of`layers of laminte built up in sections or bundles, and pronged or skeleton separators attached to an outsidelamina of each of said sections, whereby Ventilating space is provided between ad jacent sections, as described.

7. In a laminated armature-core, a lamina of soft iron having attached thereto a pronged or skeleton separator, as and for the purpose described.

8. In an armature a sheet or lamina having teeth or projections for the reception of the armature coils or armature conductors, and metal separators riveted orotherwise secured thereto, said separators extending toward the points or free ends of said teeth or projections. i

In witness whereof I have hereto set my hand this 18th day of May, 1893.

HENRY e. REIs'r Witnesses:

JOHN W. GIBBONEY, BENJAMIN B. HULL. 

